Positioning device, thread calibration machine and method

Abstract

The invention discloses a positioning device, a thread calibration machine and a method, solves the problem that in the prior art, a portable thread calibration machine is low in internal threaded hole detection efficiency, and has the beneficial effects that the detection efficiency is effectively improved, the accuracy of a measurement result is ensured, and the measurement requirements of different internal threaded holes are met. Comprising a limiting piece and a positioning piece, the positioning piece can be connected with a to-be-measured component, the positioning piece is provided with a positioning hole, the limiting piece is installed on the thread calibration machine, the limiting piece is provided with a limiting groove, and the limiting piece is clamped with the positioning piece through the limiting groove or supported through the positioning piece, so that the thread calibration machine is arranged on the outer side of the to-be-measured component. And a probe of the thread calibration machine passes through the positioning hole of the positioning piece and enters the to-be-detected threaded hole of the to-be-detected component.

Description

Technical Field

[0001] The present invention relates to the technical field of thread calibration, and in particular to a positioning device, a thread calibration machine and a method. Background Art

[0002] The statements in this part merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] The threaded holes of many small structural parts are machined. To achieve precision manufacturing, the threaded holes need to be detected. Most can be put into use directly after being detected by a fixed thread calibration machine at the production site. However, for large parts, these parts are heavy and not easy to be carried to the fixed thread calibration machine for detection. At the site, only the pass / fail judgment can be made for the threaded holes of these parts, especially for tapered internal threaded holes, and full-parameter detection cannot be achieved.

[0004] There are studies on portable thread calibration machines in the prior art. These thread calibration machines are movable and can be carried to larger parts to measure the relevant internal threaded holes. The thread calibration machine is provided with a probe, and the probe can penetrate into the internal threaded hole for contact scanning measurement. However, there are the following problems:

[0005] The portable thread machine is supported by other structural parts to ensure the measurement accuracy, but its position is not easy to determine;

[0006] Moreover, there are multiple internal threaded holes on the component that need to be measured, and multiple cross-sections of the same internal threaded hole need to be measured. Each time, adjustment is required, which results in low measurement efficiency;

[0007] The initial position of the probe entering the internal threaded hole cannot be determined, whether it is the position in the X direction or the Y direction. That is to say, there is no way to accurately position the position of the probe entering the internal threaded hole, and the measurement result is greatly affected by the measurement starting position, which affects the measurement accuracy;

[0008] In addition, the measurement result is also affected by the measurement direction of the probe. The measurement direction is not restricted, and it is easy for the measurement direction of the probe to deviate, thus affecting the accuracy of the measurement result. Summary of the Invention

[0009] Aiming at the deficiencies of the prior art, the first object of the present invention is to provide a positioning device to ensure the accuracy of the measurement result.

[0010] To achieve the above object, the present invention is realized by the following technical solutions:

[0011] A positioning device includes a limiting member and a positioning member. The positioning member can be connected to a component to be measured. The positioning member is provided with a positioning hole. The limiting member is installed on a thread calibration machine. The limiting member is provided with a limiting groove. The limiting member is engaged with the positioning member through the limiting groove or the positioning member supports the limiting member, so as to place the thread calibration machine outside the component to be measured. The probe of the thread calibration machine passes through the positioning hole of the positioning member and enters the thread hole to be measured of the component to be measured.

[0012] As described above, the positioning device can fix the thread calibration machine outside the component to be measured through the cooperation of the positioning member and the limiting member, realizing the fixation of the position of the thread calibration machine, so as to perform measurement. After the positioning member is connected to the component to be measured, the length of the probe extending from the thread calibration machine is controllable, and the thickness of the positioning member is determined, so the X-direction position of the probe entering the thread hole to be measured can be determined, and the initial position of the probe in the X direction can be determined. Because the positioning member is connected to the component to be measured, after the limiting member is engaged with the positioning member or the positioning member supports the limiting member, the Y-direction position of the probe relative to the thread hole to be measured is also determined, which is beneficial to ensuring the accuracy of the measurement result.

[0013] As described above, in a positioning device, when the limiting member is engaged with the positioning member through the limiting groove or the positioning member supports the limiting member, the center line in the width direction of the limiting groove of the limiting member coincides with the center line in the width direction of the positioning hole, and the center line in the width direction of the limiting groove and the central axis of the starting position of the probe are in the same plane, further ensuring the Y-direction position of the probe entering the thread hole to be measured, so that the probe enters the center position of the thread hole to be measured, which can make the probe located at the maximum cross-section of the thread hole to be measured, thus being beneficial to the accuracy and precision of the measurement result.

[0014] As described above, in a positioning device, when the positioning member supports the limiting member through the positioning member, it means that the top end of the positioning member is in close contact with the upper side of the limiting groove, and both sides of the positioning member are in close contact with both sides of the limiting groove, ensuring the stable support of the positioning member to the limiting member, and relatively ensuring the Y-direction and Z-direction positions of the probe entering the internal thread hole.

[0015] As described above, in some other solutions of a positioning device, when the limiting member cooperates with the positioning member from the side or the bottom of the positioning member, the limiting member is engaged and connected with the positioning member through the limiting groove, so as to ensure the position of the limiting member relative to the positioning member.

[0016] As described above, in a positioning device, the limiting member is a portal structure member to form the limiting groove, so that the limiting member can be inserted from the upper side of the positioning member and move from top to bottom to realize the cooperation between the limiting member and the positioning member. The height of the positioning member is less than the height of the limiting groove. The limiting member is respectively provided with connecting holes on both sides of the limiting groove to realize the connection with the thread calibration machine.

[0017] A positioning device as described above, wherein the positioning member can be connected to the threaded hole to be measured of the member to be measured, and the connection length between the positioning member and the threaded hole to be measured is less than the length of the threaded hole to be measured, so as to leave a space for facilitating the contact measurement of the threaded hole to be measured by the probe.

[0018] A positioning device as described above. Considering that there are various members to be measured and there are threaded holes to be measured with different sizes on the surface of the same member to be measured, a plurality of positioning members are provided, and the diameters of the joints of different positioning members with the threaded hole to be measured are different, and a suitable positioning member is selected according to the size of the threaded hole to be measured.

[0019] A positioning device as described above. For the convenience of connection, the positioning member and the threaded hole to be measured are connected by a threaded structure.

[0020] A positioning device as described above. The positioning member is provided with a protruding portion on one side of the positioning hole. The protruding portion is provided with an external thread and an opening groove. The opening groove communicates with the positioning hole. The height of the positioning hole is greater than the height of the opening groove. The height of the opening groove is greater than the height of the probe, and the width of the opening groove is greater than the width of the probe. The movement direction of the probe is guided and limited through the opening groove. If deviation occurs, it will collide with the protruding portion, indicating that the measurement result is unreliable.

[0021] A positioning device as described above. The limiting member is a limiting clamping plate, and the positioning member is a positioning slider. The sides facing the thread calibration machine and away from the thread calibration machine of both are planes without protruding places, which is convenient for processing while ensuring the fixing effect on the thread calibration machine.

[0022] In a second aspect, the present invention further provides a portable thread calibration machine, including the positioning device as described above.

[0023] In a third aspect, the present invention further provides a measurement method for calibrating an internal thread, adopting the positioning device as described above, including the following steps:

[0024] Connect the positioning member to the member to be measured;

[0025] Install the limiting member on the thread calibration machine;

[0026] The limiting member is engaged with the positioning member through the limiting groove or the positioning member supports the limiting member, so as to place the thread calibration machine outside the member to be measured;

[0027] The probe of the thread calibration machine passes through the positioning hole of the positioning member and enters the threaded hole to be measured of the member to be measured, and the internal thread of the threaded hole to be measured is measured through the probe.

[0028] The beneficial effects of the present invention are as follows:

[0029] 1) In the positioning device of the present invention, the thread calibration machine can be fixed to the outside of the component to be measured through the cooperation of the positioning member and the limiting member, realizing the fixation of the position of the thread calibration machine, so as to carry out measurement. There is no need to manually adjust the height of the thread calibration machine, and there is no need for repeated adjustment. The position of the thread calibration machine can be quickly located. The probe enters the threaded hole to be measured through the positioning hole of the positioning member. The setting of the positioning hole can determine whether the moving direction of the probe is deflected. Overall, the measurement of the internal threaded hole, especially the conical internal threaded hole, is realized, and the accuracy of the measurement result is ensured. Moreover, the positioning member and the limiting member are of a split structure. For different cross-sections of the same internal threaded hole or different internal threaded holes, only the positioning member needs to be replaced, and there is no need to remove the connection between the limiting member and the thread calibration machine. The replacement speed is relatively fast, meeting the measurement requirements of threaded holes to be measured with different sizes.

[0030] 2) In the present invention, the thickness of the positioning member is determined, and the extending length of the probe from the measuring screw machine is controllable. Thus, if the extending length of the probe from the measuring screw machine is a definite value in the initial position, the X-direction position of the probe entering the threaded hole to be measured can be determined, that is, the initial position of the probe in the X direction. The positioning member is connected to the component to be measured. After the limiting member is engaged with the positioning member or the positioning member supports the limiting member, the Y-direction position of the probe relative to the threaded hole to be measured is determined, and the probe can be located at the maximum cross-section of the threaded hole to be measured, which is beneficial to the accuracy and precision of the measurement result.

[0031] 3) In the present invention, by limiting the central axis in the width direction of the limiting groove, the central axis in the width direction of the positioning hole, and the central axis of the starting position of the probe, it can be ensured that the probe enters the central position of the threaded hole to be measured.

[0032] 4) In the present invention, the limiting member and the positioning member can be engaged and connected to ensure the relative position between the two, or the limiting member is supported by the positioning member. When the positioning member supports the limiting member, the positioning member and the limiting member are in close contact to ensure the relative position between the positioning member and the limiting member.

[0033] 5) In the present invention, the positioning member is beneficial to the characteristics of the threaded hole to be measured and is threadedly connected to the threaded hole to be measured. In this way, it can be ensured that the central axes of the positioning hole and the opening groove are on the same straight line as the central axis of the probe, ensuring the accurate position of the probe entering the threaded hole to be measured.

[0034] 6) The portable thread calibration machine provided by the present invention, through the setting of the positioning member and the limiting member, can fix the thread calibration machine to the side of the component to be measured, ensure the initial position of the probe entering the threaded hole to be measured during each measurement, and is beneficial to determining whether the moving direction of the probe is deflected through the setting of the positioning hole, thereby ensuring the accuracy of the measurement result. Description of the Drawings

[0035] The accompanying drawings forming a part of this invention are used to provide a further understanding of the invention. The schematic embodiments and descriptions thereof of the invention are used to explain the invention and shall not unduly limit the invention.

[0036] Figure 1 FIG. is a schematic diagram of a positioning device cooperating with a thread calibration machine according to one or more embodiments of the present invention.

[0037] Figure 2 FIG. is a schematic diagram of a positioning member in a positioning device according to one or more embodiments of the present invention.

[0038] In the figure: The distances or dimensions between each part are exaggerated for showing the positions of each part, and the schematic diagram is only for illustration.

[0039] Wherein: 1. positioning member, 2. groove, 3. positioning hole, 4. protrusion, 5. second connection hole, 6. limiting member, 7. probe, 8. first connection hole, 9. thread calibration machine, 10. limiting groove, 11. opening groove. Detailed embodiments

[0040] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the present invention otherwise clearly indicates, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof;

[0042] As introduced in the background art, in the prior art, there is a problem that the position of the portable thread calibration machine needs to be adjusted every time during the detection of the thread hole to be measured of the component. To solve the above technical problems, the present invention proposes a positioning device.

[0043] Embodiment 1

[0044] In a typical embodiment of the present invention, refer to Figure 1As shown in the figure, a positioning device includes a limiting member 6 and a positioning member 1. The positioning member 1 can be connected to the component to be measured. The positioning member is provided with a positioning hole 3. The limiting member 6 is installed on a thread calibration machine 9. The limiting member 6 is provided with a limiting groove 10. The limiting member 6 is engaged with the positioning member 1 through the limiting groove 10 or the positioning member 1 supports the limiting member 6, so as to place the thread calibration machine 9 outside the component to be measured. The probe of the thread calibration machine passes through the positioning hole of the positioning member and enters the thread hole to be measured of the component to be measured.

[0045] Of course, it is easily understandable that the limiting groove can be a through groove, or the depth of the limiting groove is less than the thickness of the limiting member 6, as long as the limiting member and the positioning member can cooperate.

[0046] Among them, because the positioning member 1 is connected to the component to be measured, the thickness of the positioning member 1 is determined, so the X-direction (the direction parallel to the central axis of the probe) position of the probe entering the thread hole to be measured can be determined, and the initial position of the probe 7 in the X-direction can be determined. The positioning member is connected to the component to be measured. After the limiting member and the positioning member are engaged or the positioning member supports the limiting member, the Y-direction position of the probe relative to the thread hole to be measured is also determined;

[0047] It is easily understandable that when the limiting member 6 is engaged with the positioning member 1 through the limiting groove 10 or the positioning member 1 supports the limiting member, the center line in the width direction of the limiting groove 10 of the limiting member coincides with the center line in the width direction of the positioning hole 3, and the center line in the width direction of the limiting groove 10 and the central axis of the starting position of the probe (probe major axis) are in the same plane, so as to ensure that the probe 7 enters the central position of the thread hole to be measured, thus ensuring the initial position of the probe 7, and enabling the probe to be located at the maximum cross-section of the thread hole to be measured, which is beneficial to the accuracy and precision of the measurement result.

[0048] Considering that there are various components to be measured, and there are thread holes to be measured with different sizes on the surface of the same component to be measured, multiple positioning members 1 are provided. The diameters of the joints of different positioning members 1 with the thread holes to be measured are different. Select a suitable positioning member 1 according to the size of the thread hole to be measured. In this way, the positioning member 1 can be directly adjusted according to the size of the thread hole to be measured. After a group of thread holes to be measured are measured, separate the limiting member 6 from the positioning member 1, and quickly replace the positioning member 1. After the replacement is completed, the measurement of the next group of thread holes to be measured can be carried out. Compared with an integral structure, the separately arranged positioning member 1 and limiting member 6 have better versatility, meet different usage requirements, and are more convenient to replace.

[0049] In this embodiment, the limiting member 6 is a portal-shaped structural member to form a limiting groove. The width of the limiting member 6 is smaller than the width of the thread calibrator, and the height of the limiting member 6 is smaller than the height of the measuring end of the thread calibrator. The width of the positioning member 1 is adapted to the width of the limiting groove 10. In this way, the limiting member 6 can be inserted from the upper side of the positioning member and moved from top to bottom to realize the cooperation between the limiting member 6 and the positioning member 1. The height of the positioning member 1 is smaller than the height of the limiting groove 10. The first connection holes 8 are respectively arranged on both sides of the limiting groove for the limiting member 6. Two first connection holes 8 can be arranged on each side of the limiting groove 10. The positions of the first connection holes 8 correspond to the positions of the openings at the connection end surface of the thread calibrator 9. Screws pass through the first connection holes 8 to realize the connection between the limiting member 6 and the thread calibrator 9.

[0050] In some examples, to ensure the accurate cooperation between the limiting member 6 and the positioning member 1, along the height direction of the positioning member 1, as shown in Figure 2 shown, grooves 2 or ridges can be arranged on the side of the positioning member 1. The groove of the positioning member is arranged on the side of the positioning member close to the component to be measured. A ridge matching the groove 2 or a groove matching the ridge of the positioning member is arranged on the inner side of the limiting member 6. In this way, not only the accurate positioning of the two can be ensured, but also the separation and cooperation of the two can be realized quickly.

[0051] Specifically, the limiting member 6 can be a symmetric structure, and the positioning member 1 can also be a symmetric structure. The limiting groove 10 is located at the central position of the limiting member 6. After the position of the limiting member 6 relative to the thread calibrator 9 is determined, the cooperation between the limiting member 6 and the positioning member 1 can ensure the initial position of the probe 7 entering the threaded hole to be measured.

[0052] Moreover, it is easy to understand that the support of the limiting member 6 by the positioning member 1 means that the top end of the positioning member 1 is in close contact with the upper side surface of the limiting groove 10 (realizing surface-to-surface contact), and both sides of the positioning member 1 are in close contact with both sides of the limiting groove 10 (the width of the limiting groove is equal to or slightly smaller than the width of the positioning member), ensuring the stable support of the positioning member 1 for the limiting member 6 and relatively ensuring the Y-direction and Z-direction positions of the probe 7 entering the internal threaded hole.

[0053] In this embodiment, to realize the connection between the positioning member 1 and the component to be measured and enable the probe 7 to pass through the positioning hole and enter the threaded hole to be measured, the positioning member 1 can be connected to the threaded hole to be measured of the component to be measured. The connection length between the positioning member 1 and the threaded hole to be measured is smaller than the length of the threaded hole to be measured to leave space for the probe to perform contact measurement on the threaded hole to be measured.

[0054] For convenient connection, the positioning member 1 and the threaded hole to be measured are connected by a threaded structure. In this way, it can be ensured that the central axes of the positioning hole 3 and the opening groove 11 are all on the same straight line as the central axis of the probe 7, ensuring the accurate position of the probe 7 entering the threaded hole to be measured.

[0055] Specifically, the positioning hole 3 in the positioning member 1 is an elongated hole. Second connection holes 5 are respectively arranged at positions of the positioning member 1 close to the four corners. The second connection holes 5 can assist in connecting the positioning member 1 with the component to be measured. Under normal conditions, it is only necessary for the positioning member 1 to be connected to the component to be measured through the protruding portion 4. In some examples, screws can pass through the second connection holes to realize the connection between the positioning member and the component to be measured.

[0056] It is easily understandable that a protruding portion 4 is arranged on one side of the positioning hole 3 of the positioning member 1 (the side away from the thread calibration machine). The protruding portion 4 can be a cylindrical section. An external thread is arranged on the protruding portion 4. An opening groove 11 is arranged on the protruding portion 4. The opening groove 11 is along the radial direction of the protruding portion 4. The opening groove 11 communicates with the positioning hole 3. The height of the positioning hole is less than the height of the positioning member 1. The height of the positioning hole 3 is greater than the height of the opening groove 11. The height of the opening groove 11 is greater than the height of the probe 7. The width of the opening groove 11 is the same as the width of the positioning hole 3. The width of the opening groove 11 is slightly greater than the width of the probe 7. The length of the probe 7 is greater than the sum of the thicknesses of the positioning member 1 and the protruding portion 4. The movement direction of the probe 7 is guided and limited through the opening groove 11. If there is deflection, it will collide with the protruding portion, indicating that the measurement result is unreliable. The height of the positioning hole ensures the movement of the probe along the Z-direction.

[0057] In addition, as Figure 2 shown, in some examples, a through groove is arranged on the side of the positioning member 1 facing the thread calibration machine 9. The through groove communicates with the positioning hole 3. The height of the through groove is the same as the height of the positioning member 1. The through groove is perpendicular to the direction of the probe. The arrangement of the through groove can enable the probe 7 to smoothly enter the threaded hole to be measured.

[0058] In this embodiment, the limiting member 6 is a limiting clamping plate. Each side surface of the limiting member is a plane. The positioning member 1 is a positioning slider. Except for the side facing the component to be measured, other side surfaces of the positioning member are planes. The thickness of the limiting member can be greater than, equal to or less than the thickness of the positioning member. The side surfaces of both of them facing the thread calibration machine and the side surfaces away from the thread calibration machine are planes without any protrusions, which is convenient for processing while ensuring the fixing effect on the thread calibration machine.

[0059] The positioning device provided in this embodiment can fix the thread calibration machine 9 on the outside of the component to be measured through the cooperation of the positioning member 1 and the limiting member 6, realizing the fixation of the position of the thread calibration machine, so as to perform measurement. After the positioning member 1 is connected to the component to be measured, the length of the probe 7 extending from the thread calibration machine 9 is controllable. Since the thickness of the positioning member 1 is determined, the X-direction position of the probe 7 entering the threaded hole to be measured can be determined, and the initial position of the probe 7 in the X-direction can be determined. Further, the limiting member 6 is engaged with the positioning member 1 or the positioning member supports the limiting member, and accordingly the Y-direction position of the probe entering the threaded hole to be measured is determined, which is beneficial to ensuring the accuracy of the measurement result.

[0060] Embodiment Two

[0061] The difference between this embodiment and the first embodiment is as follows:

[0062] When the limiting member cooperates with the positioning member from the side or the bottom of the positioning member, the limiting member is snap-fitted with the positioning member through the limiting groove, so as to ensure the position of the limiting member relative to the positioning member and the stability of the connection and the accuracy of the measurement. Here, from the side of the positioning member, including the side of the positioning member away from the component to be measured. At this time, a limiting groove can be provided at the center of the limiting member, and the limiting groove is snap-fitted with the positioning member, or the limiting member is snap-fitted with the positioning member from the side edge of the positioning member, or a limiting groove is provided on the side of the limiting member, and the limiting member is snap-fitted with the positioning member from left to right or from right to left from the side of the positioning member. Or, the limiting member cooperates with the positioning member from the bottom of the positioning member. At this time, the limiting member is a U-shaped member, and the limiting member moves upward from below the positioning member and is snap-fitted with the positioning member.

[0063] Embodiment Three

[0064] This embodiment provides a portable thread calibration machine, which includes a positioning device described in the first embodiment or the second embodiment. The portable thread calibration machine (thread detector) is a prior art. The portable thread calibration machine is provided with a probe, and the probe is a double-headed probe. The portable thread calibration machine can drive the probe to enter the threaded hole to be measured through the positioning hole and the opening groove, and move linearly along the X direction and the Z direction. One end of the portable thread calibration machine is a reference surface to form surface-to-surface contact with the limiting member and the positioning member, and the probe can penetrate from the reference surface.

[0065] Embodiment Four

[0066] This embodiment provides a measurement method for calibrating internal threads, which can realize the measurement of internal threads at large components such as bogies. It adopts a positioning device described in the first embodiment or the second embodiment, and includes the following contents:

[0067] The positioning member 1 is connected to the component to be measured through the protruding portion 4;

[0068] The limiting member 6 is installed on the thread calibration machine 9 through the first connection hole 8;

[0069] The limiting member 6 is snap-fitted with the positioning member 1 through the limiting groove 10 or the positioning member 1 supports the limiting member 6, so as to place the thread calibration machine 9 outside the component to be measured;

[0070] The probe 7 of the thread calibration machine passes through the positioning hole 3 of the positioning member and enters the threaded hole to be measured of the component to be measured. The thread calibration machine drives the probe 7 to move in the X direction and the Z direction, and realizes the measurement of the internal thread in the threaded hole to be measured through the probe 7.

[0071] Moreover, after the detection of the first cross-section of a threaded hole to be measured is completed, the position of the positioning member relative to the member to be measured can be adjusted. After the adjustment is completed, the positioning member and the limiting member cooperate again to realize the detection of another cross-section of a threaded hole to be measured.

[0072] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A positioning device, characterized in that, It includes a limiting member and a positioning member. The positioning member can be connected to the component to be measured. The positioning member is provided with a positioning hole. The limiting member is installed on the thread calibrator. The limiting member is provided with a limiting groove. The limiting member is engaged with the positioning member through the limiting groove or the positioning member supports the limiting member, so as to place the thread calibrator outside the component to be measured. The probe of the thread calibrator passes through the positioning hole of the positioning member and enters the thread hole to be measured of the component to be measured.

2. The positioning device according to claim 1, characterized in that, When the limiting member is engaged with the positioning member through the limiting groove or the positioning member supports the limiting member, the center line in the width direction of the limiting groove of the limiting member coincides with the center line in the width direction of the positioning hole. The center line in the width direction of the limiting groove and the central axis of the starting position of the probe are in the same plane, so as to ensure the Y-direction position of the probe entering the internal thread hole.

3. A positioning device according to claim 1, wherein The positioning member supports the limiting member means that the top end of the positioning member is in close contact with the upper side of the limiting groove, and both sides of the positioning member are in close contact with both sides of the limiting groove.

4. A positioning device according to claim 1, wherein When the limiting member cooperates with the positioning member from the side or from the bottom of the positioning member, the limiting member is engaged with the positioning member through the limiting groove.

5. The positioning device according to claim 1, characterized in that, The limiting member is a gantry structure member to form the limiting groove. The height of the positioning member is less than the height of the limiting groove. The limiting member is provided with connection holes on both sides of the limiting groove to realize the connection with the thread calibrator.

6. The positioning device according to claim 1, wherein The positioning member can be connected to the thread hole to be measured of the component to be measured. The connection length between the positioning member and the thread hole to be measured is less than the length of the thread hole to be measured.

7. The positioning device according to claim 6, characterized in that, A plurality of positioning members are provided. The diameters of the connections of different positioning members with the thread hole to be measured are different. A suitable positioning member is selected according to the size of the thread hole to be measured.

8. A positioning device according to claim 6, characterized in that, The positioning member is connected to the thread hole to be measured through a thread structure.

9. The positioning device according to claim 6, characterized in that, The positioning member is provided with a protrusion on one side of the positioning hole. The protrusion is provided with an external thread. The protrusion is provided with an opening groove. The opening groove communicates with the positioning hole. The height of the positioning hole is greater than the height of the opening groove. The height of the opening groove is greater than the height of the probe. The width of the opening groove is greater than the width of the probe. The moving direction of the probe is guided through the opening groove.

10. A positioning device according to claim 1, characterized in that, The limiting member is a limiting buckle plate, and the positioning member is a positioning slider.

11. A portable thread calibration machine, characterized in that, It includes a positioning device according to any one of claims 1-10.

12. A measuring method for calibrating internal threads, characterized in that, The adoption of any one of claims 1-10 includes the following content: The positioning member is connected to the component to be measured; The limiting member is installed on the thread calibrator; The limiting member is engaged with the positioning member through the limiting groove or the positioning member supports the limiting member, so as to place the thread calibrator outside the component to be measured; The probe of the thread calibrator passes through the positioning hole of the positioning member and enters the thread hole to be measured of the component to be measured. The internal thread of the thread hole to be measured is measured through the probe.

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